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Bug 678336 (CVE-2019-3812)

Summary: [TRACKER] qemu: Out-of-bounds read in hw/i2c/i2c-ddc.c allows for memory disclosure (CVE-2019-3812)
Product: Gentoo Security Reporter: Thomas Deutschmann (RETIRED) <whissi>
Component: VulnerabilitiesAssignee: Gentoo Security <security>
Status: RESOLVED FIXED    
Severity: normal Keywords: Tracker
Priority: Normal    
Version: unspecified   
Hardware: All   
OS: Linux   
Whiteboard:
Package list:
Runtime testing required: ---
Bug Depends on: 678302, 678338    
Bug Blocks:    

Description Thomas Deutschmann (RETIRED) gentoo-dev 2019-02-18 21:36:55 UTC
QEMU through version 2.10 through to 3.1.0 is vulnerable to an out-of-bounds read of up to 128 bytes in the hw/i2c/i2c-ddc.c:i2c_ddc() function. A local attacker with permission to execute i2c commands could exploit this to read stack memory of the qemu process on the host.

Systems without a monitor connected are affected, a virtual monitor is presented to virtual guests.  Systems with no graphics cards attached to the virtual host are not affected.

Upstream patch:

https://github.com/qemu/qemu/commit/b05b267840515730dbf6753495d5b7bd8b04ad1c